Year	million ton-km
1970	36.000000000099995
1971	37.8999996184
1972	40.0999994277
1973	42.10000085830001
1974	44.00000000000001
1975	45.4000000953
1976	47.30000019079999
1977	52.199999809299996
1978	56.199999809299996
1979	59.400001525899995
1980	56.300000190700004
1981	54.69999980920001
1982	46.5000000001
1983	44
1984	51.5000000001
1985	53.10000085830001
1986	54.100000381499996
1987	55.100000381499996
1988	58.3000011443
1989	74.09999847419999
1990	91.0000019073
1991	84.7999978065
1992	108.6999995261
1993	133.7000001073
1994	153.19999936230002
1995	177.0999965742
1996	169.9999990611
1997	204.80000217260002
1998	207.4740037939
1999	181.21900475360002
2000	190.89199999999997
2001	150.13
2002	140.548
2003	154.17800000000003
2004	159.90599999999998
2005	151.235
2006	169.074
2007	219.08599999999998
2008	192.783
2009	124.72999999999999
2010	122.82118550483335
2011	86.1420568679561
2012	123.18672353861166
2013	135.89104478
2014	165.63870558000002
2015	153.047416682
2016	190.54678064650875
2017	258.60434
2018	305.88687
2019	351.15340896
2020	154.09941184234435
2021	219.627277